US3434599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter-drier unit
Assignee: Sporlan Valve Co
•
Filing: 1967-04-28
•
Granted: 1969-03-25
•
Expires: 1987-04-28
Abstract
No abstract record available.
Inventors
- 👤 William F Wischmeyer
- 👤 John E Hoffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:22
CPC Classifications
B; B01; B01D; B01D17/00; B01D17/02; B01D17/0202; F; F25; F25B; F25B43/00; F25B43/003
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2233093A
Cited
US2512797A
Cited
US2617986A
Cited
US2796989A
Cited
US2963744A
Cited
US3261473A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-24 | 1972-09-23 | 1973-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-24 | 1976-09-23 | 1977-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-24 | 1980-09-23 | 1981-03-25 | $7700.00 | Window Closed / Lapsed |